fix: compile warnings boost cpp >14 and zmq send and recv

meson.build

 project('batmen', 'cpp',
     version: '1.0',
     license: 'LGPLv3',
-    default_options: ['cpp_std=c++11'],
+    default_options: ['cpp_std=c++14'],
     meson_version: '>=0.40.0'
 )
 

src/network.cpp

@@ -32,17 +32,13 @@ void Network::bind(const std::string &socket_endpoint)
 
 void Network::write(const string &content)
 {
-    // Let's make sure the sent message is in UTF-8
-    string msg_utf8 = boost::locale::conv::to_utf<char>(content, "UTF-8");
-
-    LOG_F(INFO, "Sending '%s'", msg_utf8.c_str());
-    _socket->send(msg_utf8.data(), msg_utf8.size());
+    _socket->send(zmq::buffer(content), zmq::send_flags::none);
 }
 
 void Network::read(string &received_content)
 {
     zmq::message_t message;
-    _socket->recv(&message);
+    _socket->recv(message, zmq::recv_flags::none);
 
     received_content = string((char*)message.data(), message.size());